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Phase-Dependent Squeezing in Dual-Comb Interferometry.

Daniel I Herman1, Molly Kate Kreider1,2, Noah Lordi2

  • 1University of Colorado Boulder, Department of Electrical, Computer and Energy Engineering, Boulder, Colorado 80309, USA.

Physical Review Letters
|May 11, 2026
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Summary
This summary is machine-generated.

Researchers developed a new time-domain method to characterize squeezed light pulses using dual-comb interferometry. This technique reveals quantum noise below the shot noise level, enabling quantum-enhanced timing and tomography.

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Area of Science:

  • Quantum optics
  • Laser physics
  • Optical metrology

Background:

  • Squeezing quantum noise in continuous-wave lasers has advanced optical interferometry.
  • Optical frequency comb interferometry with pulsed squeezed sources has lagged despite the importance of frequency combs in metrology.

Purpose of the Study:

  • To introduce a novel time-domain approach for characterizing squeezed femtosecond light pulses.
  • To enable quantum-enhanced applications in dual-comb interferometry.

Main Methods:

  • Utilizing dual-comb interferometry to generate time-domain interferograms.
  • Employing multiheterodyne beating between a Kerr soliton-squeezed frequency comb and a coherent state comb.
  • Analyzing interferogram noise to reveal phase-dependent squeezing and antisqueezing.

Main Results:

  • Demonstrated quantum noise dipping below the shot noise level by up to 3.8±0.2 dB.
  • Observed phase-dependent squeezing and antisqueezing at alternating zero crossings.
  • Modeled the nonstationary quantum noise as a periodic optical displacement.

Conclusions:

  • The developed time-domain method effectively characterizes squeezed femtosecond light pulses.
  • Results pave the way for quantum-enhanced dual-comb timing applications.
  • Supports advancements in high-speed quantum state tomography using dual-comb interferometers.